Zimmerman will also join CSC’s audit committee and serve as chairman.
He brings turnaround experience as the company’s board and management team is taking steps to address financial performance, Chairman Rodney Chase said in a release.
Zimmerman has also held senior finance positions at IBM over a 32-year career there, including corporate controller.
He currently serves as a director at Brunswick Corp. and Delphi Automotive and previously was a director at Stanley Black & Decker Inc.
In June, CSC named Gary Budzinski president of global infrastructure services and Sunita Holzer chief human resources officer, coinciding with the retirement of James Sheaffer, head of the North American public sector.